Tanah sebagai bioreaktor landasan system of rice intensification
 Artikel Jurnal
Lind, Douglas A., author
Study guide for use with statistical techniques in business and economics
McGraw-Hill-Irwin, 2010
 Buku Teks
Study guide for use with economics of social issues
by Devon L. Yoho ... [and others]
BPI, 1988
 Buku Teks
Dewar, Diane M., author
Essentials health economics student study guide
Jones & Bartlett Learning, 2011
 Buku Teks
Leftwich, Richard H., author
Study guide to accompany economics of sosial issues
United States of America, 1984
 Buku Teks
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